St. Leo is a permanently closed Catholic parish in St. Louis City, MO. The parish was founded in 1888. The parish closed in 1978.
- Year founded: 1888
- Year closed: 1978 (90 years)
- Territory merged into: St. Bridget of Erin - St. Louis City
Formed out of Saint Bridget and Saint Teresa. Closed in late 1960s, merging with Saint Bridget. Reopened as a shrine in 1971 before formally closing in 1978
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